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Which, if any, C++ compilers do tail-recursion optimization?
...htforward: Just switch on optimisation for speed:
For MSVC, use /O2 or /Ox.
For GCC, Clang and ICC, use -O3
An easy way to check if the compiler did the optimisation is to perform a call that would otherwise result in a stack overflow — or looking at the assembly output.
As an interesting his...
Prepend a level to a pandas MultiIndex
I have a DataFrame with a MultiIndex created after some grouping:
5 Answers
5
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Run two async tasks in parallel and collect results in .NET 4.5
...t this wrong was answer until I ran it. then I understood. It really does execute in 5 seconds. The trick is to NOT await the tasks immediately, instead await on Task.WhenAll.
– Tim Lovell-Smith
Apr 3 '14 at 9:13
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Importing from builtin library when module with same name exists
...a now-deprecated approach.
The importlib documentation here gives a good example of the more appropriate way to load a module directly from a file path for python >= 3.5:
import importlib.util
import sys
# For illustrative purposes.
import tokenize
file_path = tokenize.__file__ # returns "/pa...
Rebase a single Git commit
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You can cherry-pick XX to master.
git checkout master
git cherry-pick <commit ID of XX>
And remove the last commit from the feature branch with git reset.
git checkout Feature-branch
git reset --hard HEAD^
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How can I tell if a DOM element is visible in the current viewport?
...uld use Dan's solution if you do not need to support version of Internet Explorer before 7.
Original solution (now outdated):
This will check if the element is entirely visible in the current viewport:
function elementInViewport(el) {
var top = el.offsetTop;
var left = el.offsetLeft;
var w...
Extending an Object in Javascript
... from Java to Javascript, and it's a bit hard for me to figure out how to extend objects the way I want it to do.
16 Answer...
How to echo with different colors in the Windows command line
... a rare thing to see an windows without .NET framework even for the oldest XP/2003 installations) . It uses jscript.net compiler to create an exe capable to print strings with different background/foreground color only for the current line.
@if (@X)==(@Y) @end /* JScript comment
@echo off
setlocal
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How to get my IP address programmatically on iOS/macOS?
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The following code finds all IPv4 and IPv6 addresses on an iOS or OSX device. The first getIPAddress method acts more or less as the older code in this answer: you can prefer either one or the other type address, and it always prefers WIFI over cellular (obviously you could change this).
Mor...
Efficiency of premature return in a function
This is a situation I encounter frequently as an inexperienced programmer and am wondering about particularly for an ambitious, speed-intensive project of mine I'm trying to optimize. For the major C-like languages (C, objC, C++, Java, C#, etc) and their usual compilers, will these two functions ru...